Carl Sagan Signed Photo 4×6 – COA JSA

Description

Presented is a 4×6 color photo autographed by Carl Sagan in blue felt tip (“9”).

Carl Sagan was an American astronomer, planetary scientist, and science communicator. His best known scientific contribution is his research on the possibility of extraterrestrial life, including experimental demonstration of the production of amino acids from basic chemicals by exposure to light. He assembled the first physical messages sent into space, the Pioneer plaque and the Voyager Golden Record, which were universal messages that could potentially be understood by any extraterrestrial intelligence that might find them. He argued in favor of the hypothesis, which has since been accepted, that the high surface temperatures of Venus are the result of the greenhouse effect.

Authentication: JSA Basic Cert & Sticker

Carl Sagan Signed Photo